Thought I'd add a simple tutorial to this thread for those that might care....
I've been messing around over the past couple of years with straps that I bought or came on watches that I wasn't overly happy with - actually this started with the croc strap that came with my new/gen 88....
My go-to product for softening leather is Obenauf's leather oil - I also found that it will alter the tome and the color of some leathers.
I recently bought a lovely Simona 26/26 croc strap for my 569 that looked a lot different / darker in the pictures; when it arrived it was a boring honey brown color that I wasn't keen on. So, I set about my typical process to alter the color to my taste & thought I take pictures to share.
Starting point:
I always start the process with cleaning the straps with a mild soap and water, followed by heating them with a hair drier - this helps for the oil to soak in properly. Make sure to test a small area on the inside of the strap to make sure you like the color its going to develop - I use the area around the fixed keeper.
Heat the straps again and then quickly spread a liberal amount of oil evenly along each strap, then heat them again. You will see the oil start to penetrate from the grain (cracks) inward through the larger grain areas.
I continue to apply heat every 15 minutes or so and also massage the straps with my fingers - pushing the oil into the areas furthest from the cracks. After about an hour it looks like this.
Another hour and the straps are ready for a good wiping / buffing with clean micro-fiber cloths and mounting to the watch. There will still likely be a few stubborn areas (see between the lugs) but they will fill in. In my experience, the color will lighten over the next few weeks, but not by much. I much prefer the strap now....
Now a gorgeous chestnut / burgundy color and incredibly soft.....